x86, AMD IOMMU: do runtime list initialization at compile time

[pandora-kernel.git] / arch / x86 / Kconfig

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 5a82f18..b120cff 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -551,10 +551,18 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
 
 config AMD_IOMMU
        bool "AMD IOMMU support"
-       select SWIOTL
-       depends on X86_64 && PCI
+       select SWIOTLB
+       depends on X86_64 && PCI && ACPI
        help
-         Select this to get support for AMD IOMMU hardware in your system.
+         With this option you can enable support for AMD IOMMU hardware in
+         your system. An IOMMU is a hardware component which provides
+         remapping of DMA memory accesses from devices. With an AMD IOMMU you
+         can isolate the the DMA memory of different devices and protect the
+         system from misbehaving device drivers or hardware.
+
+         You can find out if your system has an AMD IOMMU if you look into
+         your BIOS for an option to enable it or if you have an IVRS ACPI
+         table.
 
 # need this always selected by IOMMU for the VIA workaround
 config SWIOTLB